Structurally and electronically driven uniaxial negative thermal expansion in BaIrO.

Negative thermal expansion is known to exist in a range of structure types but is extremely rare in hexagonal perovskites. Here we demonstrate that BaIrO displays negative linear thermal expansion in the direction of its face-shared IrO trimers, and apparent zero volume thermal expansion below 100 K. We present evidence that this anomalous thermal expansion is driven by an unusual form of rigid body phonon behaviour governed by the effective trimer valence state and therefore has structural and electronic components to the underlying mechanism.

First experimental time-of-flight-based proton radiography using low gain avalanche diodes.

Ion computed tomography (iCT) is an imaging modality for the direct determination of the relative stopping power (RSP) distribution within a patient's body. Usually, this is done by estimating the path and energy loss of ions traversing the scanned volume utilising a tracking system and a separate residual energy detector. This study, on the other hand, introduces the first experimental study of a novel iCT approach based on time-of-flight (TOF) measurements, the so-called Sandwich TOF-iCT concept, which in contrast to any other iCT systems, does not require a residual energy detector for the RSP determination.

A spectroscopic-imaging scanning tunneling microscope in vector magnetic field.

Cryogenic scanning tunneling microscopy and spectroscopy (STM/STS) performed in a high vector magnetic field provide unique possibilities for imaging surface magnetic structures and anisotropic superconductivity and exploring spin physics in quantum materials with atomic precision. Here, we describe the design, construction, and performance of a low-temperature, ultra-high-vacuum (UHV) spectroscopic-imaging STM equipped with a vector magnet capable of applying a field of up to 3 T in any direction with respect to the sample surface. The STM head is housed in a fully bakeable UHV compatible cryogenic insert and is operational over variable temperatures ranging from ∼300 down to 1.

Factors Predictive of Mortality among Geriatric Patients Sustaining Low-Energy Blunt Trauma.

Background: In geriatric trauma patients, higher mortality rate is observed compared to younger patients. A significant portion of trauma sustained by this age group comes from low-energy mechanisms (fall from standing or sitting). We sought to investigate the outcome of these patients and identify factors associated with mortality.

Changes of Subjective Symptoms and Tear Film Biomarkers following Femto-LASIK.

Femtosecond laser-assisted in situ keratomileusis (Femto-LASIK) represents a common treatment modality in refractive surgery and shows excellent results in terms of safety, efficacy, predictability, and long-term stability. However, patients may be affected by dry eye symptoms. The aim of this study was to identify a potential association between subjective dry eye symptoms, objective dry eye markers, and possible changes in the tear film, which could be a target for future therapy development.

Elastocaloric determination of the phase diagram of SrRuO.

One of the main developments in unconventional superconductivity in the past two decades has been the discovery that most unconventional superconductors form phase diagrams that also contain other strongly correlated states. Many systems of interest are therefore close to more than one instability, and tuning between the resultant ordered phases is the subject of intense research. In recent years, uniaxial pressure applied using piezoelectric-based devices has been shown to be a particularly versatile new method of tuning, leading to experiments that have advanced our understanding of the fascinating unconventional superconductor SrRuO (refs.

Infrared Thermographic Imaging of Chest Wall Perfusion in Patients Undergoing Coronary Artery Bypass Grafting.

Coronary artery disease represents a leading cause of death worldwide, to which the coronary artery bypass graft (CABG) is the main method of treatment in advanced multiple vessel disease. The use of the internal mammary artery (IMA) as a graft insures an improved long-term survival, but impairment of chest wall perfusion often leads to surgical site infection and increased morbidity and mortality. Infrared thermography (IRT) has established itself in the past decades as a non-invasive diagnostic technique.

Endovascular Management of Bleeding Aortoenteric Fistula May be Feasible as a Definitive Repair.

Aorto-enteric fistula (AEF) is a complication with devastating sequelae and significant morbidity. Although open surgery remains primary treatment endovascular approach may be used as a temporary bridge but rarely as a definitive therapy. We present a case of a patient who presented with a secondary AEF, due to hemodynamic instability we chose to treat the fistula with an aortic endograft.

Two Auxinic Herbicides Affect Plant Hormone Levels and Induce Molecular Changes in Transcription.

With the introduction of the new auxinic herbicide halauxifen-methyl into the oilseed rape () market, there is a need to understand how this new molecule interacts with indigenous plant hormones (e.g., IAA) in terms of crop response.

[COVID-19 pandemic-related burden and SARS-CoV-2 prevalence in care facilities].

Background: Care facilities are particularly challenged by the COVID-19 pandemic. Besides others this includes human and structural resources.

Objective: This cross-sectional study evaluated the occurrence of infections, psychosocial stress and the different strategies to handle the COVID-19 pandemic in care facilities.

[Long-term outcomes of PRK, LASIK and SMILE].

Background: Patients and refractive surgeons have a legitimate interest in the long-term results of the most commonly used laser procedures for correction of ametropia.

Objective: To assess the safety, predictability, stability and late complications according to the current recommendations of the committee for refractive surgery (KRC).

Methods: Literature search in PubMed with the search term "long-term outcome" combined with either "PRK", "LASIK" or "SMILE".

Magnetic-Field Tunable Intertwined Checkerboard Charge Order and Nematicity in the Surface Layer of Sr RuO.

In strongly correlated electron materials, the electronic, spin, and charge degrees of freedom are closely intertwined. This often leads to the stabilization of emergent orders that are highly sensitive to external physical stimuli promising opportunities for technological applications. In perovskite ruthenates, this sensitivity manifests in dramatic changes of the physical properties with subtle structural details of the RuO octahedra, stabilizing enigmatic correlated ground states, from a hotly debated superconducting state via electronic nematicity and metamagnetic quantum criticality to ferromagnetism.

Strain-Stabilized (π, π) Order at the Surface of FeTe.

A key property of many quantum materials is that their ground state depends sensitively on small changes of an external tuning parameter, e.g., doping, magnetic field, or pressure, creating opportunities for potential technological applications.

Detection of postlaser vision correction ectasia with a new combined biomechanical index.

Purpose: To validate and evaluate the use of a new biomechanical index known as the Corvis biomechanical index-laser vision correction (CBI-LVC) as a method for separating stable post-LVC eyes from post-LVC eyes with ectasia.

Setting: 10 clinics from 9 countries.

Design: Retrospective, multicenter, clinical study.

Epi-Bowman keratectomy versus alcohol-assisted photorefractive keratectomy: wound healing and complications.

Purpose: In Epi-Bowman Keratectomy™ (EBK), a new dynamic multi-blade single-use device (Epi-Clear™, Orca Surgical, Israel) is utilized to remove the epithelium by sweeping movements across the corneal surface. Epithelial cells are discarded. Alcohol or other chemical agents are not utilized.

Directed, Elliptic, and Higher Order Flow Harmonics of Protons, Deuterons, and Tritons in Au+Au Collisions at sqrt[s_{NN}]=2.4 GeV.

Flow coefficients v_{n} of the orders n=1-6 are measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons, and tritons as a function of centrality, transverse momentum, and rapidity in Au+Au collisions at sqrt[s_{NN}]=2.4  GeV. Combining the information from the flow coefficients of all orders allows us to construct for the first time, at collision energies of a few GeV, a multidifferential picture of the angular emission pattern of these particles.

Repeatability and reproducibility of manifest refraction.

Purpose: To evaluate the intraexaminer repeatability and the interobserver reproducibility of manifest refraction.

Setting: Tertiary referral center.

Design: Retrospective study.

Results of thin-cap small-incision lenticule extraction.

Purpose: To evaluate the influence of a thin cap in small-incision lenticule extraction (SMILE) for the correction of myopia or myopic astigmatism.

Setting: Tertiary care private practice.

Methods: A chart review of 102 eyes of 51 patients was performed.

Thermal Load During Corneal Excimer Laser Ablation: Impact of Different Ablation Parameters.

Purpose: To characterize the impact of different ablation parameters on the change in peak corneal temperature during corneal excimer laser ablation.

Methods: Forty-two ablations were performed (21 on polymethylmethacrylate [PMMA] and 21 on porcine eyes) simulating photorefractive keratectomy (PRK), transepithelial PRK, and laser in situ keratomileusis (LASIK) treatments. Each ablation was recorded using infrared thermography.

Multicritical Fermi Surface Topological Transitions.

A wide variety of complex phases in quantum materials are driven by electron-electron interactions, which are enhanced through density of states peaks. A well-known example occurs at van Hove singularities where the Fermi surface undergoes a topological transition. Here we show that higher order singularities, where multiple disconnected leaves of Fermi surface touch all at once, naturally occur at points of high symmetry in the Brillouin zone.

Strong Absorption of Hadrons with Hidden and Open Strangeness in Nuclear Matter.

We present the first observation of K^{-} and ϕ absorption within nuclear matter by means of π^{-}-induced reactions on C and W targets at an incident beam momentum of 1.7  GeV/c studied with HADES at SIS18/GSI. The double ratio (K^{-}/K^{+})_{W}/(K^{-}/K^{+})_{C} is found to be 0.

Clinical outcomes of small incision lenticule extraction versus advanced surface ablation in low myopia.

Purpose: To compare the visual and refractive outcomes of small incision lenticule extraction and advanced surface ablation for low myopia or myopic astigmatism.

Methods: Retrospective, observational case series of our first 50 consecutive small incision lenticule extraction patients compared to refraction-matched 50 advanced surface ablation treatments with attempted spherical equivalent correction ⩽-3.5 D, astigmatism ⩽-1.

Varifocal Versus Monofocal LASIK in Presbyopic Hyperopic Eyes.

Purpose: To compare varifocal (SupraCor; Technolas Perfect Vision GmbH, Munich, Germany) to monofocal (Zyoptix TissueSaving; Bausch & Lomb, Rochester, NY) LASIK in patients with hyperopic presbyopia.

Methods: In this prospective, non-randomized, comparative case series, consecutive patients with hyperopia, presbyopia, and emmetropia as target refraction were bilaterally treated with varifocal (8 patients) or monofocal (7 patients) LASIK. The study was designed for 35 patients, but was terminated early after interim analysis.

Small incision lenticule extraction for the correction of high myopia.

Purpose: Excimer laser-based refractive procedures can have less predictable results when used for correcting high myopia than when used for moderate myopia. Small incision lenticule extraction might overcome this weakness. However, small incision lenticule extraction is only Food and Drug Administration approved for use in myopic eyes up to -8 D with astigmatism of -3 D or less.